[llvm-dev] Why getFunction() of CallGraphNode return NULL function?

[Qiuping Yi via llvm-dev]

Hi all,

I want to find all the called functions in each function, thus I iterate
the calledFunctions of each CallGraphNode in CallGraph as follow:

for (CallGraph::iterator it = CG->begin(); it != CG->end(); ++it) {
   CallGraphNode* node = it->second;
   for (CallGraphNode::iterator it2 = node->begin(); it2 != node->end();
++it2) {
      Function* calledFunc = it2->second=>getFunction();
      cerr << ”function: “ << calledFunc->getName().str() <<"\n";  *//
crash some times*
      ... ...
      ... ...
    }
}

I found that some time "calledFunc" is NULL function and thus the output
crash. I don't known why? If the before code is wrong, so what is the
correct method for get all the called functions?

I use LLVM 3.6. Thank you all in advance.

--------------------------------------------
Qiuping Yi
Institute Of Software
Chinese Academy of Sciences
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